Theorem 1.4 ([1]}) 
If \(M^3\subset \mathbb {R}^4\)  has \(\lambda (M) \le \lambda (\mathbb {S}^2\times \mathbb {R})\)  then after a small \(C^\infty \) -perturbation to a nearby hypersurface \(M^{\prime }\) , the mean curvature flow \(M^{\prime }(t)\)  is completely smooth until it disappears in a round point.

